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O'Mara: Evidence shows Trayvon attacked

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'Stand your ground' one year later

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'Stand your ground' one year later03:45

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Questions have long surrounded the woman. Martin family attorney Benjamin Crump first played an audio recording of the woman a year ago at a news conference. The recording seemed to have very poor quality.

Vowing to keep fighting for his son Trayvon -- even after Zimmerman was acquitted of murder -- Tracy Martin said that his family wants to turn "negative energy" surrounding their plight "into a positive."